Power Measurement 3300 ACM - Page 26

Installation 2-15
3300 ACM Installation and Operation Manual Power Measurement Ltd.
SHLD
RS-485 PORT RS-485 PORT
RS-485 PORT
RS-485 PORT
PORT
RS-485
RS-232C
Computer or
Modem
RS-232C to RS-485 Converter
SHLD
_
+
3300 ACM
Base Module
RS-485 PORT
_
+
3300 ACM
Base Module
RS-485 PORT
SHLD
SHLD
SHLD
_
+
_
+
3300 ACM
Base Module
RS-485 PORT
SHLD
DO NOT
CONNECT
RS-485 PORT RS-485 PORT
DO NOT
CONNECT
3-way star
connection
point not
allowed
PORT
RS-485
RS-232C
Computer or
Modem
RS-232C to RS-485 Converter
+
_
SHLD
SHLD
_
+
_
+
_
+
SHLD
SHLD
SHLD
_
+
_
+
SHLD
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
3300 ACM
Base Module
RS-485 PORT
STAR CONNECTION
T-CONNECTION
3300 ACM
Base Module
RS-485 PORT
Figure 2.6.3 RS-485 Topologies to Avoid
Courtesy of NationalSwitchgear.com